Nailing machine



E. C. NORTHRUP De cn 31% 1923a NAILING MACHINE s Sheets-Sheet 1 Filed Jan. 26 1920 fitness: (M o Dec, 318 11923,

E. C. NORTHRUP NAILING MACHINE Filed Jan. 26, 1920 5 Sheets-Sheet 2 mv ENTOR .277 C/VbETHRl/P.

Dec. 18 9 1923.

E C. NORTHRUP NAILING MACHINE 5 Sheets-Sheet 5 Filed Jan. 26 1920 M 6 6 m 7v E. c. N ORTHRUP NAILING MACHINE Dec. 118 11923.

Filed Jan. 26 1920 5 Sheets-Sheet 5 figlji INVENIOR ECA bIeTHm/Fa M i mess.-

Patented Dee. a, 11923.

'UNHTEED stares an e. monrnnur, OF SAN r -:crsco, canriroau'ra.

NAILING MIAGZEFINE.

Application filed January as, me. Serial no. 354,070.

T all w/zo-m 2'2.- mag roncern:

Be it known that I, ELMER C. Norms,

a citizen of. the United States, and a resi dent of the city and county of San Francisco and State of California, have invented ing nails. An object of the inventionis to provide -a nailing machine in which are incorporated improved means for feeding the nails to the a new and useful Nailing Machine, of which the following is a specification. a

My invention relates to machines for drivchucks.

Another object of the invention is to provide a nailing machine in which improved means are used for mounting and operating the nail chucks.

Another object of the invention is to provide a nailing machine in which the period during which the Work is held beneath-the nail chucks is substantially coextensive'with the nailing operation, thus giving the operator the maximum time for removing the work and positioning the next pieces.

The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following-description-of the preferred form ,of my invention which is illustrated in the draw. ings accompanying and forming part of the specification. It is to be understood that it do not limit myself to the showing made by the said drawings and description; as I may adopt variations of the preferred form within the scope of my invention as set forth in the claims.

Referring to the drawings: 7 Figure 1 is a front elevation of the nailing machine of my invention. Figure is a'right side elevation of the machine, certain of the parts being omitted for greater clearness. Figure 3 is a rear elevation of the machine, showing the parts when the hammers are raised. Figure 4: is a rear elevation of the upper portion of the machine showing the parts when the hammers are in lowestposition. Figure 5 is a horizontal sectional view taken in-the plane 55 of Figure 1. Figure 6 is a front elevation of two of the nail feeding arms and related mechanism. Figure 7 is a right side elevation of the structure shown in Figure 6. Figures'8 and 9 are planviews of ortions of the nail chutes and show nail ceding means in two successive positions. Figure 10 is aleft side el vation of the upperfront portipn of the machine, showing the nail feed operating means; 7

For convenience of descri tion my nailing machine may be considered as comprising the following groups of mechanism.

1. A frame upon which the various instrumentalities are mounted and co-ordinated to operate as a unit of mechanism.

2. A table resiliently supported on the frame, and u on which the box or other work to be nai ed is positioned against suitable gaugese i 3. A hammer bracket mounting a plurality of hammers for driving the nails from the chucks into the box, and also adjustably spaced nail chucks for holding the nails immediately prior to driving, together with means for suspending the nail chucks from a the hammer bracket so that the engagement of the chucks with: the work about to be nailed is substantially co-exteiisive with the driving of the nail.

4. Power driven means, the action of which is .pedally initiated for actuating the hammer block.

5. Means for automatically disconnecting the power supplying means from the hammer block actuat means at the conclusion of each nailing operation; and automatically operating means for controlling the momentum of the moving parts of the driving means, so that such driving means will come to rest in substantially the same position after each nailing operation' 6. Means for feeding nails to all or certain of the chucks as required.

Under subtitles briefly identifying these groups and in the same order, I w1ll now describe the construction of my device in detail.

Frame.The frame of the machine comprises a bed plate 2 adapted to rest on the floor and from which two spaced posts 3 and 4 extend upwardly to the cross piece 6. Extending upwardly from the cross piece, and slanting slightly to the left are two other spaced posts 7 and 8 joined at the top by the cross piece 9. V

Tabla-Vertically slidably arranged on the flanged edges 11 of the posts 3 and 4t is a table 12 upon-which the work 13 is supported. .The table is additionally supported on the post 14 which is vertically adjustable by means of the threaded collar 16 in posedin the socket 18 on the under side of the table, and is threaded for the nuts 19 which prevent the table from being forced off the post 14 by the heavy spring 21 interposed between the bottom of the socket 18 and the collar 22 on the post. Thus the table is resiliently mounted and gives slightly from its adjusted level'dui'ing the operation of the machine to compensate for variations in the material or adjustments. Gauges 23 and 2/4 adjustably secured to the table by screws, provide means for positionthe work thereon.

- in %a/m/mer bracket and chdcks.-Slidably lchucks v36 of known construction into which nails are fed as needed. Each chuck is provided with a bolt 37 adapted-to engage in a T-slot 38 formed in the chuck bracket 39,

' so that the chucks may be spaced to give the desired spacing of the nails. The chuck bracket is also slidably mounted on the flanged edge 26 of the frame posts 7 and 8, and is operatively connected to the hammer bracket so that it falls to permit gravital engagement of the ends of the chucks with the work, just prior to the application of the driving force upon the heads of the nails by the hammers, and rises again to first position with the initial upward movement of the hammer bracket. This character movement is of great importance since it permits the longest possible interval between successive nailing operations. for the removal and placin of the work. This connection is supplie by spaced arms'41 pivoted to the chuck bracket and resiliently drawn together by the coiled spring 42. The arms are bent so that their upper portibns are inclined sharply toward each other,-the inclined ortions engaging on their adjacent edges, ro lers 43 mounted on studs set in the hammer bracket. A stud 44 fixed in the cross piece 6, and passing loosely through a lug 46 on the chuck bracket limits the upward movement of the chuck bracket. With the hammer and chuck brackets in their upper positions as shown in Figures 1, 2 and 3, the chuck bracket is pendantly supported from the hammer bracket by the arms 41 strongly and resiliently engaged against the rollers 43. Qwing to the slant of the arms, there is a vertical componentof the force 5 Secured to the hammer revesea erted by the spring, which tends to cause the two brackets to approach each other. Downward movement of the hammer bracket 'is controlled by the connecting rods 28, and the chuck bracket cannot move upwardly owing toits'engagement with the head of the stud 44, Therefore at the beginning of the downward movement of the hammer bracket, the chuck bracket remains stationary, the arms 41 approaching each other until with the lessening of the tension of the spring 42, the efi'ective weightof. the chuck bracket balances 'or exceeds the vertical component of the spring tension, whereupon the chuck bracket also falls, engaging the ends of the chucks with the work to be nailed. The parts are now as shown in Figure 4, the .r0llers 43 lying in the bend of the arms. When the hammer bracket begins its upward movement, the chuck bracket is picked up at-substantially the same moment owing to the resilient engagement of the arms 41 with the rollers, and the fact that the vertical com-' ponent of the spring tension is greater than the force restraining the upward movement of the chuck bracket, as soon as the rollers engage the edges of the upper bent portions ofthe arms. When the chuck bracket reaches the limit of its upward movement as determined by the stud 44, it stops, the

hammer bracket continuing to the top of its stroke, against the resistance of the arms 41 which are thereby spread apart as shown in Figure 3. Preferablypins 47 are fixed in the ends of the arms, adapted to engage the top edge of the hammerbracket if the spring 42 should fail. In order to drive the nails at a slight-angle, the posts 7 and 8 on which the ways 26 are formed are inclined at the desired angle as shown particularly in Figuresl and 3. Gauge 49 for facilitating the placing of the work is secured to the under Y side of the chuck bracket.

Hammer dm'm'ng. mean8.Journalled in suitable bearings arranged on the bed plate of the frame is the main driving shaft 51 upon which a driving pulley 52 is rotatably mounted. The pulley is connected by a belt 53 with any suitable source of power. Tnterposed' between the pulley and the shaft 51 is a clutch mechanism of-kn'own'form including the sleeve 54 splined upon the shaft, and longitudinally movable thereon by, means of the yoke 55 operated by the pedal 56. A pinion 57 on the shaft 51 drives gear 58 on the shaft 31 on which the hammer block operating cranks 29 are liked.

Downward pressure on the pedal 56 therefore-engages the clutch mechanism with the pulley, and causes the shafts 51 and 31 to rotate, the latter shaft at relatively low speed. One revolution of the shaft 31 low-- ers the hammer block to drive thenaiis in v the chucks and raises it again to first position.

I Means for dz'sconmctz'ng the driving pulleg and brake.-S1nce each nailing operation must be followed by the removal of the work and the positioning of new work, it is desirable to bring the operation of the nail driving mechanisms to a halt immediately following each nailing operation. F urthermore the moving parts should come to rest in substantially the same position each time,

with the cranks 29:11; the top of. their stroke. F ixed rigldly on the shaft 31 is an arm 59,

. Figure 4, the end of which is adapted to engage a cam surface 61 of a lug 62 formed on one side of theyoke 55. vWith the parts at rest and the clutch sleeve 54: in the disengaged position, the arm end lies just below and to one side of the lug 62. l/Vith the throwing in of the clutch, the sleeve moves over to the left (of igure 5) and the cam surface 61 then lies in the path of the arm 59 which simultaneously began to rotate with the shaft 31 Nearing the end of one complete revolution of the shaft 31, the arm end engages the cam surface and forces the yoke to the right (of Figure 5) thus freeing the clutch. Braking meansare alsc brought into operation at this moment for controlling the momentum of the rotating parts.- Fixed on the shaft 51 is abrake d we 63 adapted to be frictionally engaged by the pivoted brake lever 64 curved to fit the drum and provided with a suitable lining. A bellcrank lever 66 is pivoted to the frame and provided with aroller 67 on one of its arms bearing on the crank arm 29 which in this relatiOn acts as a cam to impart motion to the lever 66. The other arm 66 of the bellcrank lever is provided with an adjustable screw 68 ada-pted'to engage a spring pressed in 69 held in the end of the brake lever, hus rotation of the crank arm 29 to its topstroke position operates the lever 66 and resiliently forces the brake 64: against the drum, the degree of resilient pressure and l the point-at which the braking action is ini- Means'are provided for feeding nails to the nail chucks in accordance with the need of the nailing mechanism and no nails are fed a to chucks from which a nail is not to be driven.

Fixed on the cross arm 9 of the frame is a bracket 71 in which a series of nail chutes 72 are arranged in'a own'manner. A nail nevasea i box 73 of known construction into which to a crank 76 fixed on the shaft77 which is rotated by the sprocket wheel '7 8. A chain 79 connects this sprocket with sprocket 81 on shaft 82 with the large gear. 83 which meshes with a pinion 84: arranged on the side of the driving pulley 52. Thus the nail box is vibrated by the rotating pulley 52 irrespective of the operation of the other mechanism So that the nail chutes are kept filled. Below the end of each chute is a funnel 86 adjustably secured to the bracket 71, and connected by flexible conductors 87 to the nail chucks.

Pivotally mounted on the bracket 71 in front ofdthe lower end of each nail chute is a feed arm 88, the upper end of which is formed to provide a cam edge 89 to be engaged by a roller 91, disposed on a pin' 92 set in a shaft 93. The shaft is journalled in bearings arranged on the bracket 71 and is given an intermittentrocking motion by means of the crank arm 94, Figure 10,fixed on the end of the shaft and. connected by rod 96 to the hammer bracket. Thus each roller is reciprocated back and forth across the face of the associated cam 89. Figure 6 shows a roller 91 at one end of its stroke. With each complete vibration ofthe shaft, the arm 88 is rockedin'a clockwise direction against the pull of the spring 97, from the position shown by the arm 88, Figure 6, across the end of the. associated nailchute to the position-shown by the arm 88, Figure 6, and then allowed to return to first positions. Secured to the arm 88 by screw 98'is a flat spring 99, prevented from rotating on the screw by guard pieces 101. The end 102 of the spring is bent at right angles and so disposed as to lie in frontof and slightly spaced from a wedge point finger 103 adjustably secured to the lower end of the arm 88 by a clamp nut 104. With the rocking of the arm as the roller 91 moves upon the cam 89, ,the finger 103, which normally lies across the end of the nail chute as shown in Figure 9 and at the right of Figure 6, is

first withdrawn to.v a position shown in:

Figure 8, and at the. left of Figure 6, allowing the leading nail 106 to slidedownwardly against the end 102 of the spring arm which moved across the chute asthe finger 103 was withdrawn. The parts are now in the po sition shown at the left of Figure 6 and in Figure 8. As the roller 91 recedes from the cam 89, the lower endof the arm moves back tofirstposition, the wedge point of finger 103 intercepting the second nail 107' and the. leading nail 106 dropping out of the end of.

the chute into the associated funnel, as soon as the end 102 ofthe spring arm clears the chute. Every time the roller rocks the arm movement of the hammer block drives the first nail and releases a second nail which falls into the chuck, the second downward movement of the hammer block drives the second nail and releases a third, and so on.

Since each roller 91 associated with a given feed arm 88 controls the release of a nail, it follows that by removing a roller as in the case shown at-the right of. Figures 1 and 6, the associated feed arm is not operative and the associated chuck remains empty. This is done to adapt a machine for driving a less number of nails than its .full capacity and is accomplished by removing the cotter pin 108 which normally retains the roller upon its pin.

I claim: I -1. In a nailing machine, a slidably mounted hammer bracket, a slidably mounted nall chuck bracket, means for reciprocating the hammer bracket, a pair of bent arms pivoted to one of said brackets, studs on the other i of said brackets engaged by said arms, and

means for resiliently pressingsaid arms mto engagement with said studs.

2. In a nailing machine, a slidably mounted hammer bracket, a slidably mounted nail chuck bracket, means for reciprocating the hammer bracket, a pair of bent arms pivoted to one of said brackets, a pair of rollers pivotally mounted on the other of said brackets in position to be engaged by said arms, and

a spring connecting said arms for resiliently pressing said arms upon said rollers.

3-. In a nailing machine, a slidably mount- K I ed hammer bracket, a slidably mounted nail chuck bracket, means for reciprocating the hammer bracket, a pair of studs fixed on one of said brackets, rollers'pivoted on said studs, a pair of arms pivoted on the other of said brackets, each arm having a portion bent at an angle to the rest of the-arm and adapted to engage one ofthe rollers, a

spring for resiliently engaging each "arm -wi,th itsroller, and means for limiting the movement of the nail chuck bracket.

' 4: In a nailing machine, a frame, a hammer bracket'sl'idably arranged on said frame,

a nail chuck bracket slidably arranged on said frame, means for reciprocating the hammer bracket, a stud on one of said brackets, a bent arm pivoted on the other 59f said bra e in engagem nt w th s id naaasea stud, and means for resiliently pressing said arm against said stud. v

5. In a nailing machine, a frame, a hammer bracket slidably arranged on said frame,

a nail chuck bracket slidably arranged on said frame, means for reciprocating the hammer bracket, a stud on one of sald brackets, a bent arm pivoted on the other of said brackets in engagement with said stud, means for resiliently pressing said arm against said stud, and a stop for limit ing the movement ofsaid nail chuck bracket. v In a nailing machine, a frame, a ham mer bracket slidably arranged on said frame, a nail chuck bracket slidably arranged on said frame, means for reciprocating the hammer bracket, a pair of studs on one of said brackets, a pair of bent arms pivoted on the other of said brackets, a coil spring connecting the said. arms to press them resiliently against the studs, and a stop on said frame for limiting the movement of said nail chuck bracket. I

7. In a nailing machine, a frame, a table on said frame for holding the work -to be nailed, a nail chuck bracket slidably. ar-

ranged on said frame above said table, a

plurality of nail chucks on said bracket, a hammer bracket slidably arranged on said frame, a plurality of hammers on said ham mer bracket cooperating with said nail chucks, means for reciprocating said hammer bracket to drive nails from said nail chucks, means for feeding nails to said nail chucks, and means connecting the nail chuck bracket to the hammer bracket for permit ting the nail chucks to gravitationally engage the wdrk on said table immediately on said frame, for holding the work to be nailed, a nail chuck bracket slidably arranged on said frame above said table, a. plurality of nail chucks on said bracket, a hammer bracket slidably arranged on said frame, a plurality of hammers on said hammer bracketcooperating with said Tnail chucks, means for reciprocating said hammer bracket to drive nails from said nail chucks, means for feeding nails to said nail chucks, a pair of studs on one of said brackets, a pair of arms pivoted to the .other of said brackets and having bent portions engaging said studs, means for resiliently pressing the arms against the studs to; resiliently draw said brackets together, and a stop for limiting the movement of the nail chuck bracket on the recovery movement of the hammer bracket. 1 9, 1. a nailing m h ne, a r m h see 5.

brackets together, means for reciprocating said hammer bracket and a stop on said frame for limiting the movement of said M chuck bracket.

In testimony whereof, I have hereunto set my hand at Oakland, California, this 19th day of January, 1920.

ELMER c. NORTHRUP.

- In presence of- J. B. GARDNER, D. B. COOLEY. 

